A suspect wanted for stabbing a 39-year-old man to death outside a historic former Bronx NYPD stationhouse made his getaway in a cab — where a surveillance camera captured his image, police said Wednesday.

Cops on Wednesday released a surveillance image of the suspect taken inside the cab and asked the public’s help identifying him and tracking him down.

Victim Shamel Parnell got into an argument with his killer before being stabbed in the neck and chest on Bathgate Ave. near E. Tremont Ave. at about 12:20 a.m. Monday, cops said.

Medics rushed Parnell to St. Barnabas Hospital , where he died about 25 minutes later, officials said.

“I still haven’t cried,” the victim’s shocked mother, Sherri Parnell, 61, told the Daily News Tuesday. “I couldn’t sleep last night. I still can’t be

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